ABAP Select data from SAP table MATV_WWW into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MATV_WWW table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to MATV_WWW. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the MATV_WWW table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_MATV_WWW TYPE STANDARD TABLE OF MATV_WWW,
      WA_MATV_WWW TYPE MATV_WWW,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <MATV_WWW> TYPE MATV_WWW.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MATV_WWW.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MATV_WWW
  INTO TABLE IT_MATV_WWW.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MATV_WWW
*  INTO TABLE @DATA(IT_MATV_WWW2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_MATV_WWW INDEX 1 INTO DATA(WA_MATV_WWW2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MATV_WWW ASSIGNING <MATV_WWW>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MATV_WWW>-MANDT = 1.
<MATV_WWW>-MATNR = 1.
<MATV_WWW>-VKORG = 1.
<MATV_WWW>-VTWEG = 1.
<MATV_WWW>-SPRAS = 1.

ENDLOOP.

LOOP AT IT_MATV_WWW INTO WA_MATV_WWW.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MATV_WWW-LVORM, sy-vline,
  WA_MATV_WWW-MATKL, sy-vline,
  WA_MATV_WWW-ARKTX, sy-vline,
  WA_MATV_WWW-VRKME, sy-vline,
  WA_MATV_WWW-MEINS, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_MATV_WWW you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_MATV_WWW TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_MATV_WWW INTO WA_MATV_WWW.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MATV_WWW-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MATV_WWW-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MATV_WWW-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MATV_WWW-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MATV_WWW-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MATV_WWW-VRKME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MATV_WWW-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MATV_WWW-MEINS.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MATV_WWW_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPRAS TYPE STRING,
LVORM TYPE STRING,
MATKL TYPE STRING,
ARKTX TYPE STRING,
VRKME TYPE STRING,
MEINS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MATV_WWW_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_MATV_WWW_STR-MANDT sy-vline 
WA_MATV_WWW_STR-MATNR sy-vline 
WA_MATV_WWW_STR-VKORG sy-vline 
WA_MATV_WWW_STR-VTWEG sy-vline 
WA_MATV_WWW_STR-SPRAS sy-vline 
WA_MATV_WWW_STR-LVORM sy-vline 
WA_MATV_WWW_STR-MATKL sy-vline 
WA_MATV_WWW_STR-ARKTX sy-vline 
WA_MATV_WWW_STR-VRKME sy-vline 
WA_MATV_WWW_STR-MEINS sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.